I too have a '69 . Mine is a 27' Overlander International. I am fortunate in that it is all original with the exception of the upholstery. although there is an original piece on the wall in the bed area.

The carpet in mine is a medium green short loop and covers all floor space. I have found a carpet at the local HD that is a very close match.

Have as yet to find any thing even similar to the fabric used for upholstery.

cupboard latches are available from Inland Rv at Inlandrv. com. They may have the window props also.

Window screen is just nylon screen from a local hardware store . Use a screen roller tool to install . Mine turned out great. I used the original plastic screen bead.